164 



fifth somite of the abdomen 9 mm., the sixth 12 mm., the telson 20 mm. and the latter appears 

 as long as the outer uropod and 0,5 mm. shorter than the inner. Telson armed with 4 pairs 

 of dorso-lateral spinules, besides those at the tip. 



In the adult animal the antennal flagellum is 2y 4 -times as long as the body, the former 

 measnring 300 mm., the latter 135 mm., both in a male and in an ova-bearing female, but 

 in a female, long 125 mm., the flagellum measured 325 mm., 2,6-times as long as the body, 

 and in a male, long 106 mm., it was 3-times as long, viz. 310 mm. 



One of the two young individuals from Stat. 262 is 73 mm. long and the youngest of 

 all that were collected, the carapace is 15,5 mm., the rostrum 21,5 mm., the abdomen 36 mm. 

 long, the latter thus as long as carapace and rostrum combined. The rostrum (Fig. 39^) is 

 strongly curved upward, reaching far above the teeth of the carapace, slender and tapering to 

 the acuminate tip ; the carapacial carina is armed with 6 teeth, of which the 4 th is the largest, 

 while the 5" 1 and the 6 th are placed before the orbital margin ; the rostrum proper carries more- 

 over 2 smaller teeth on its proximal half, one opposite the 3 rd antennular article, the other 

 opposite the apex of the antennal scale. The 5 th abdominal somite is 3,75 mm. long, the 6 th 

 5,25 mm., the telson 9,75 mm. The external maxillipeds reach in this young specimen beyond 

 the antennal scale by one-third of their terminal joint and their exopodite is still very small, 

 rudimentary. The i st pair of legs, though shorter than the external maxillipeds, still just reach 

 beyond the antennal scale, the carpus of the 3 rd pair projects as far forward as the external 

 maxillipeds, the carpus of the 4 lh pair as far as the antennal scale, while the carpus of the 

 5 th pair reaches to the distal third of the latter. 



As was already remarked by Spence Bate, Heteroc. laevis A. M.-Edw. from Martinique 

 seems to be the nearest related form. In this species, however, the i st carapacial tooth stands 

 a little before the middle of the carapace and the 3 or 4 posterior teeth are placed close 

 together, there is, finally, no tracé visible of the two long lateral carinae, characteristic of 

 Heteroc. gibbosus Bate. 



General distribution: Off Tablas Island (Bate); Andaman Sea, Bay of Bengal, 

 Arabian Sea, off the Travancore coast (Alcock). 



5. Heterocarpus Icpidus de Man. PI. XIV, Fig. 40 — 40^. 



Heterocarpus lepidus J. G. de Man, in: Zoologische Mededeelingen, uitgegeven vanwege 's Rijks 

 Museum van Natuurlijke Historie te Leiden. Deel III, Afl. 4, December 191 7, p. 282. 



Stat. 215a. Oct. 29. West 1000 m. distant from north point of Kabia-island reef. Banda Sea. 



500 m. Bottom stone. 1 female without eggs. 

 Stat. 262. Dec. 18. s°53'.8S., I32°48'.8E. Kei-islands. 560 m. Bottom solid bluish grey mud, 



upper layer more liquid and brown mud. 1 male. 



A new species pertaining to that Section of the genus, in which none of the abdominal 

 terga are produced posteriorly into spines and in which the dactyli of the three posterior legs 

 are very short. 



The two specimens of this species, which in its outer appearance closely resembles 

 Heteroc. tricarinatus Alcock & Anderson, are nearly of the same size: the carapace of the 



